I found this video and it looks like JCR performance have made a supercharger kit for the 1368 egnines.
[nomedia="http://www.youtube.com/watch?v=UyQQMJQHWSk&feature=related"]YouTube- Fiat 500 Supercharged[/nomedia]
http://www.youtube.com/user/JCRracingTEAM
http://www.jcrracing.co.uk/
[nomedia="http://www.youtube.com/watch?v=UyQQMJQHWSk&feature=related"]YouTube- Fiat 500 Supercharged[/nomedia]
http://www.youtube.com/user/JCRracingTEAM
http://www.jcrracing.co.uk/